Here you can find the source of recusivelyCollectFileListing(ArrayList
public static void recusivelyCollectFileListing(ArrayList<String> rc, Path base, Path directory) throws IOException
//package com.java2s; /**//w w w . j a v a 2 s. c om * Copyright 2005-2016 Red Hat, Inc. * * Red Hat licenses this file to you under the Apache License, version * 2.0 (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or * implied. See the License for the specific language governing * permissions and limitations under the License. */ import java.io.IOException; import java.nio.file.DirectoryStream; import java.nio.file.Files; import java.nio.file.Path; import java.util.ArrayList; public class Main { public static void recusivelyCollectFileListing(ArrayList<String> rc, Path base, Path directory) throws IOException { try (DirectoryStream<Path> directoryStream = Files.newDirectoryStream(directory)) { for (Path path : directoryStream) { if (Files.isDirectory(path)) { recusivelyCollectFileListing(rc, base, path); } else { rc.add(base.relativize(path).toString()); } } } } }